identify important design and development problems. The purpose of t h e study w a s t o arganize these problems i n t o a program which would produce . components for use i n a molten-salt breeder experiment (MSBE).The reference design concept i s a two-region, two-fluid system w i t h t h e f u e l s a l t separated from t b e blanket salt by graphite tubes. The energy produced i n t h e reactor f l u i d i s transferred t o a secondary coolant-salt c i r c u i t , which couples the reactor t o a supercritical. stem cycle. The specific development problems t o be studied include t h e reactor core and heafi exchanger hydraulics, pumps for t h e three salt systems, heat t r a n s f e r i n t h e heat exchangers and boiler-superheater, mechanical valves f o r salt flow control, control rod and drive, pressure r e l i e f i n coolant system, c e l l insulation and heaters, and t h e cover gas system. The program ineludes separate loops f o r t h e boiler-superheater and for t h e coves gas system i n addition t o several s m a l l t e s t stands f o r individual components.The f i n a l demonstratfon of the performance of the components and system w i l l be made i n an essentially isothermal engineering test unit (ETU) . I n addition t o providing performance demdnstrations , t h e ETU w i l l be used t o t r a i n operators f o r t h e MSBE. A cost surmnary and schedule f o r t h e program cover eight years from t h e start of t h e project. DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER
Three centrifugal pump impellers fabricated of Inconel were subjected to endurance testing under cavitating conditions with sodium and with molten salt (fused fluorides) at temperatures of 1050–1400 F. The tests were run (one with sodium and two with molten salt) at or near pump design head and flow conditions to establish the extent of impeller damage sustained during long periods of operation and to observe the effects upon performance. Descriptions are provided of the test impellers and volutes, of the experimental apparatus, and of the test operations. The cavitation damage is described by the effects on hydraulic performance and with photomicrographs and metallurgical analyses. Damage was manifested by the formation of pits in excess of 1/4 in. in depth. No change in performance was detected.
Two small, h e l i c a l induction pumps of d i f f e r e n t design were operated with potassium a t temperatures up t o 1300°F t o determine hydraulic, thermal, and c a v i t a t i o n-inception charact e r i s t i c s and t o q u a l i f y them f o r use a s b o i l e r feed pumps i n boiling-condensing potassium t e s t f a c i l i t i e s .
Washington 25, D. C. _ LEGAL NOTICE Thrs report was prepared as on occount of Government sponsored work. Neither the United States nor the Commission, rwr ony person acting on behalf of the Commission A. Makes ony warranty or representation, express or imp lied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights, or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, opporotus, method, or process disclosed m this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission to the extent that such employee or contractor prepares, handles or distributes, or provides access to, any information purs uant to his emp loyment or controct with the Commission, ORNL-2544 Contract No. W.7405-eng-26
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